Got a quick question on this one. 2002 F-350 4X4 7.3PSD 346,000 miles. I replaced the HPOP and IPR about 6,000 miles (2 weeks) ago, and O/H the ORIGINAL, UNTOUCHED 4R100 at the same time. Other than maintenance (3k oil changes, brakes and 2 sets of wheel beari... Login to read more.